diff --git a/homeassistant/components/discovery/__init__.py b/homeassistant/components/discovery/__init__.py
index 1e29d066f2d7d..d12e9d2c54bfa 100644
--- a/homeassistant/components/discovery/__init__.py
+++ b/homeassistant/components/discovery/__init__.py
@@ -37,7 +37,6 @@
 SERVICE_MOBILE_APP = "hass_mobile_app"
 SERVICE_NETGEAR = "netgear_router"
 SERVICE_OCTOPRINT = "octoprint"
-SERVICE_PLEX = "plex_mediaserver"
 SERVICE_ROKU = "roku"
 SERVICE_SABNZBD = "sabnzbd"
 SERVICE_SAMSUNG_PRINTER = "samsung_printer"
@@ -51,7 +50,6 @@
     SERVICE_DAIKIN: "daikin",
     SERVICE_TELLDUSLIVE: "tellduslive",
     SERVICE_IGD: "upnp",
-    SERVICE_PLEX: "plex",
 }
 
 SERVICE_HANDLERS = {
diff --git a/homeassistant/components/plex/config_flow.py b/homeassistant/components/plex/config_flow.py
index d61da8609a9a4..84b16817ca89d 100644
--- a/homeassistant/components/plex/config_flow.py
+++ b/homeassistant/components/plex/config_flow.py
@@ -11,11 +11,10 @@
 from homeassistant import config_entries
 from homeassistant.components.http.view import HomeAssistantView
 from homeassistant.components.media_player import DOMAIN as MP_DOMAIN
-from homeassistant.const import CONF_SSL, CONF_TOKEN, CONF_URL, CONF_VERIFY_SSL
+from homeassistant.const import CONF_TOKEN, CONF_URL, CONF_VERIFY_SSL
 from homeassistant.core import callback
 from homeassistant.helpers.aiohttp_client import async_get_clientsession
 import homeassistant.helpers.config_validation as cv
-from homeassistant.util.json import load_json
 
 from .const import (  # pylint: disable=unused-import
     AUTH_CALLBACK_NAME,
@@ -28,7 +27,6 @@
     CONF_USE_EPISODE_ART,
     DEFAULT_VERIFY_SSL,
     DOMAIN,
-    PLEX_CONFIG_FILE,
     PLEX_SERVER_CONFIG,
     SERVERS,
     X_PLEX_DEVICE_NAME,
@@ -180,29 +178,6 @@ async def async_step_select_server(self, user_input=None):
             errors={},
         )
 
-    async def async_step_discovery(self, discovery_info):
-        """Set default host and port from discovery."""
-        if self._async_current_entries() or self._async_in_progress():
-            # Skip discovery if a config already exists or is in progress.
-            return self.async_abort(reason="already_configured")
-
-        json_file = self.hass.config.path(PLEX_CONFIG_FILE)
-        file_config = await self.hass.async_add_executor_job(load_json, json_file)
-
-        if file_config:
-            host_and_port, host_config = file_config.popitem()
-            prefix = "https" if host_config[CONF_SSL] else "http"
-
-            server_config = {
-                CONF_URL: f"{prefix}://{host_and_port}",
-                CONF_TOKEN: host_config[CONF_TOKEN],
-                CONF_VERIFY_SSL: host_config["verify"],
-            }
-            _LOGGER.info("Imported legacy config, file can be removed: %s", json_file)
-            return await self.async_step_server_validate(server_config)
-
-        return self.async_abort(reason="discovery_no_file")
-
     async def async_step_import(self, import_config):
         """Import from Plex configuration."""
         _LOGGER.debug("Imported Plex configuration")
diff --git a/homeassistant/components/plex/const.py b/homeassistant/components/plex/const.py
index 7d6812674ca9a..d5cb3db3aba74 100644
--- a/homeassistant/components/plex/const.py
+++ b/homeassistant/components/plex/const.py
@@ -15,7 +15,6 @@
 SERVERS = "servers"
 WEBSOCKETS = "websockets"
 
-PLEX_CONFIG_FILE = "plex.conf"
 PLEX_MEDIA_PLAYER_OPTIONS = "plex_mp_options"
 PLEX_SERVER_CONFIG = "server_config"
 
diff --git a/homeassistant/components/plex/strings.json b/homeassistant/components/plex/strings.json
index cf91b8b6fb7f5..43dc47bec1040 100644
--- a/homeassistant/components/plex/strings.json
+++ b/homeassistant/components/plex/strings.json
@@ -23,7 +23,6 @@
             "all_configured": "All linked servers already configured",
             "already_configured": "This Plex server is already configured",
             "already_in_progress": "Plex is being configured",
-            "discovery_no_file": "No legacy configuration file found",
             "invalid_import": "Imported configuration is invalid",
             "non-interactive": "Non-interactive import",
             "token_request_timeout": "Timed out obtaining token",
diff --git a/tests/components/plex/test_config_flow.py b/tests/components/plex/test_config_flow.py
index da4c95c145fc3..c131a123dc9fa 100644
--- a/tests/components/plex/test_config_flow.py
+++ b/tests/components/plex/test_config_flow.py
@@ -7,7 +7,7 @@
 import requests.exceptions
 
 from homeassistant.components.plex import config_flow
-from homeassistant.const import CONF_HOST, CONF_PORT, CONF_SSL, CONF_TOKEN, CONF_URL
+from homeassistant.const import CONF_HOST, CONF_PORT, CONF_TOKEN, CONF_URL
 from homeassistant.setup import async_setup_component
 
 from .mock_classes import MOCK_SERVERS, MockPlexAccount, MockPlexServer
@@ -65,77 +65,6 @@ async def test_bad_credentials(hass):
         assert result["errors"]["base"] == "faulty_credentials"
 
 
-async def test_import_file_from_discovery(hass):
-    """Test importing a legacy file during discovery."""
-
-    file_host_and_port, file_config = list(MOCK_FILE_CONTENTS.items())[0]
-    file_use_ssl = file_config[CONF_SSL]
-    file_prefix = "https" if file_use_ssl else "http"
-    used_url = f"{file_prefix}://{file_host_and_port}"
-
-    mock_plex_server = MockPlexServer(ssl=file_use_ssl)
-
-    with patch("plexapi.server.PlexServer", return_value=mock_plex_server), patch(
-        "homeassistant.components.plex.config_flow.load_json",
-        return_value=MOCK_FILE_CONTENTS,
-    ):
-
-        result = await hass.config_entries.flow.async_init(
-            config_flow.DOMAIN,
-            context={"source": "discovery"},
-            data={
-                CONF_HOST: MOCK_SERVERS[0][CONF_HOST],
-                CONF_PORT: MOCK_SERVERS[0][CONF_PORT],
-            },
-        )
-        assert result["type"] == "create_entry"
-        assert result["title"] == mock_plex_server.friendlyName
-        assert result["data"][config_flow.CONF_SERVER] == mock_plex_server.friendlyName
-        assert (
-            result["data"][config_flow.CONF_SERVER_IDENTIFIER]
-            == mock_plex_server.machineIdentifier
-        )
-        assert result["data"][config_flow.PLEX_SERVER_CONFIG][CONF_URL] == used_url
-        assert (
-            result["data"][config_flow.PLEX_SERVER_CONFIG][CONF_TOKEN]
-            == file_config[CONF_TOKEN]
-        )
-
-
-async def test_discovery(hass):
-    """Test starting a flow from discovery."""
-    with patch("homeassistant.components.plex.config_flow.load_json", return_value={}):
-        result = await hass.config_entries.flow.async_init(
-            config_flow.DOMAIN,
-            context={"source": "discovery"},
-            data={
-                CONF_HOST: MOCK_SERVERS[0][CONF_HOST],
-                CONF_PORT: MOCK_SERVERS[0][CONF_PORT],
-            },
-        )
-        assert result["type"] == "abort"
-        assert result["reason"] == "discovery_no_file"
-
-
-async def test_discovery_while_in_progress(hass):
-    """Test starting a flow from discovery."""
-
-    await hass.config_entries.flow.async_init(
-        config_flow.DOMAIN, context={"source": "user"}
-    )
-
-    result = await hass.config_entries.flow.async_init(
-        config_flow.DOMAIN,
-        context={"source": "discovery"},
-        data={
-            CONF_HOST: MOCK_SERVERS[0][CONF_HOST],
-            CONF_PORT: MOCK_SERVERS[0][CONF_PORT],
-        },
-    )
-    assert result["type"] == "abort"
-    assert result["reason"] == "already_configured"
-
-
 async def test_import_success(hass):
     """Test a successful configuration import."""